* {
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}
ul li{
  list-style: none;
}
body {
    width: 100%;
    min-width: 320px;
    max-width: 640px;
    margin: 0 auto;
    font-size: 14px;
    font-family: -apple-system, Helvetica, sans-serif;
    color: #666;
    line-height: 1.5;
    background-color: #fff;
}
a{
    text-decoration: none;
}
.app {
 height: 45px;
 background-color: #333;
}
.app ul li{
    float: left;
    height: 45px;
    line-height: 45px;
    text-align: center;
    color: #fff;
}
.app ul li:nth-child(1){
  
    width: 8%;
}
.app ul li:nth-child(1) img{
    width: 10px;
}
.app li:nth-child(2){
  
    width: 10%;
}
.app ul li:nth-child(2) img{
    vertical-align: middle;
   
    width: 30px;
}
.app li:nth-child(3){
    width: 57%;
}
.app li:nth-child(4){
    background-color: #f63515;
    width: 25%;
}
.search_wrap {
    position: fixed;
    height: 44px;
    width: 100%;
    max-width: 640px;
    min-width: 320px;
    overflow: hidden;
}
.search_btn{
    position: absolute;
    width: 40px;
    height: 44px;
    left: 0;
    top: 0;
    /* background-color: pink; */
}
.search_login{
    position: absolute;
    width: 40px;
    height: 44px;
    right:  0;
    top: 0;
    /* background-color: pink; */
    text-align: center;
    line-height: 44px;
    color: #fff;

}
.search{
    position: relative;
    height: 30px;
    background-color: #fff;
    margin: 0 50px;
    border-radius: 15px;
    margin-top: 7px;
}
.search_btn::after{
    content: '';
    display: block;
    width: 20px;
    height: 18px;
    background: url(../images/s-btn.png) no-repeat;
    background-size: 20px 18px;
    margin: 14px 0 0 15px;
}
.jd_icon {
    position: absolute;
    width: 20px;
    height: 15px;
    /* background-color: pink; */
    top: 8px;
    left: 10px;
    background: url(../images/jd.png) no-repeat;
    background-size: 20px 15px;
}
.jd_icon::after{
    content: "";
  display: block;
    position: absolute;
    right: -7px;
    top: 0;
    width: 1px;
   background-color: #ccc;
    height: 15px;
}
.fd{
    position: absolute;
    top: 8px;
    left: 50px;
     width: 18px;
     height: 15px;
     background-color: pink;
     background: url(../images/jd-sprites.png) no-repeat -81px 0;
     background-size: 200px;

    
}
.slider img { 
    vertical-align: top;
    width: 100%;
}
.brand div{
    float: left;
    width: 33.33%;
}
.brand img{
    width: 100%;
}
nav {
    padding-top: 10px;
}
nav a{
    float: left;
    width: 20%;
    text-align: center;
    color: #666;

}
nav a span{
    display: block;
}
nav a img{
    margin: 10px 0;
    width: 40px;
}
.news a{
    float: left;
    box-sizing: border-box;
}
.news a:nth-child(1){
width: 50%;
}
.news a:nth-child(2){
    border-left: 1px solid #ccc;
width: 25%;
}
.news a:nth-child(3){
    border-left: 1px solid #ccc;
width: 25%;
}
.news img {
    width: 100%;
}